import java.util.Scanner;
// Richard Phillips Feynman was a well known American physicist and a recipient
// of the Nobel Prize in Physics. He worked in theoretical physics and also
// pioneered the field of quantum computing. He visited South America for ten
// months, giving lectures and enjoying life in the tropics. He is also known
// for his books "Surely You're Joking, Mr. Feynman!" and "What Do You Care What
// Other People Think?", which include some of his adventures below the equator.
//
// His life-long addiction was solving and making puzzles, locks, and cyphers.
// Recently, an old farmer in South America, who was a host to the young
// physicist in 1949, found some papers and notes that is believed to have
// belonged to Feynman. Among notes about mesons and electromagnetism, there was
// a napkin where he wrote a simple puzzle: "how many different squares are
// there in a grid of N ×N squares?".
//
// In the same napkin there was a drawing which is reproduced below, showing
// that, for N=2, the answer is 5.
// Input
//
// The input contains several test cases. Each test case is composed of a single
// line, containing only one integer N, representing the number of squares in
// each side of the grid (1 ≤ N ≤ 100).
//
// The end of input is indicated by a line containing only one zero.
//
// Output
//
// For each test case in the input, your program must print a single line,
// containing the number of different squares for the corresponding input.
//
// Example
//
// Input:
// 2
// 1
// 8
// 0
//
//
// Output:
// 5
// 1
// 204
// http://upload.wikimedia.org/math/4/0/8/4081e80094a0ed782f84d6ad5c20e32f.png

public class SAMER08F {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int n = s.nextInt();
		while (n != 0) {
			//int n = s.nextInt();
			int sqr = n * (n + 1) * ((2 * n) + 1) / 6;
			System.out.println(sqr);
		}
		s.close();

	}

}
